MLA

Warren, G. K. (Gouverneur Kemble), 1830-1882, cartographer. Map of Nebraska and Dakota and portions of the states and territories bordering thereon. March, 1867.. https://collections.library.yale.edu/catalog/15814776.

APA, 6th edition

Warren, G. K. (Gouverneur Kemble), 1830-1882, cartographer. (March, 1867.)[Map of Nebraska and Dakota and portions of the states and territories bordering thereon]. https://collections.library.yale.edu/catalog/15814776.